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Do not allow send_nonmember_event to be called with shadow-banned users. (#8158)

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Patrick Cloke 2020-08-25 10:52:15 -04:00 committed by GitHub
parent 6e1c64a668
commit 5099bd68da
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2 changed files with 35 additions and 5 deletions
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1
changelog.d/8158.feature Normal file
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@ -0,0 +1 @@
Add support for shadow-banning users (ignoring any message send requests).

39
synapse/handlers/message.py
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@ -647,24 +647,35 @@ class EventCreationHandler(object):
event: EventBase,
context: EventContext,
ratelimit: bool = True,
ignore_shadow_ban: bool = False,
) -> int:
"""
Persists and notifies local clients and federation of an event.
Args:
requester
event the event to send.
context: the context of the event.
requester: The requester sending the event.
event: The event to send.
context: The context of the event.
ratelimit: Whether to rate limit this send.
ignore_shadow_ban: True if shadow-banned users should be allowed to
send this event.
Return:
The stream_id of the persisted event.
Raises:
ShadowBanError if the requester has been shadow-banned.
"""
if event.type == EventTypes.Member:
raise SynapseError(
500, "Tried to send member event through non-member codepath"
)
if not ignore_shadow_ban and requester.shadow_banned:
# We randomly sleep a bit just to annoy the requester.
await self.clock.sleep(random.randint(1, 10))
raise ShadowBanError()
user = UserID.from_string(event.sender)
assert self.hs.is_mine(user), "User must be our own: %s" % (user,)
@ -725,6 +736,14 @@ class EventCreationHandler(object):
See self.create_event and self.send_nonmember_event.
Args:
requester: The requester sending the event.
event_dict: An entire event.
ratelimit: Whether to rate limit this send.
txn_id: The transaction ID.
ignore_shadow_ban: True if shadow-banned users should be allowed to
send this event.
Raises:
ShadowBanError if the requester has been shadow-banned.
"""
@ -750,7 +769,11 @@ class EventCreationHandler(object):
raise SynapseError(403, spam_error, Codes.FORBIDDEN)
stream_id = await self.send_nonmember_event(
requester, event, context, ratelimit=ratelimit
requester,
event,
context,
ratelimit=ratelimit,
ignore_shadow_ban=ignore_shadow_ban,
)
return event, stream_id
@ -1190,8 +1213,14 @@ class EventCreationHandler(object):
event.internal_metadata.proactively_send = False
# Since this is a dummy-event it is OK if it is sent by a
# shadow-banned user.
await self.send_nonmember_event(
requester, event, context, ratelimit=False
requester,
event,
context,
ratelimit=False,
ignore_shadow_ban=True,
)
dummy_event_sent = True
break